CVE-2021-39144

Estado: AnalizadaAlta (8.5)⚠ Explotación activa

XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker has sufficient rights to execute commands of the host only by manipulating the processed input stream. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. XStream 1.4.18 uses no longer a blacklist by default, since it cannot be secured for general purpose.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Puntuación base: 8.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 98%
Percentil entre todas las CVEs puntuadas: 100
Fecha de la puntuación: 29/9/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

CISA KEV — explotada activamente

Añadida al catálogo: 10/3/2023
Plazo de remediación: 31/3/2023
Uso conocido en ransomware: Unknown

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1210 Exploitation of Remote Serviceslateral movement85 %

XStream vulnerable a RCE por deserialización sin validar entrada; vector AV:N con PR:L indica acceso remoto a servicio comprometido. Ejecución de comandos del host confirmada; potencial acceso a cuentas si proceso elevado.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability Scanning Threat Intelligence Program Privileged Account Management Network Segmentation Disable or Remove Feature or Program Application Isolation and Sandboxing

Tecnologías afectadas (15)

Debian — Debian Linux Fedoraproject — Fedora Netapp — Snapmanager Oracle — Business Activity Monitoring Oracle — Commerce Guided Search Oracle — Communications Billing AND Revenue Management Elastic Charging Engine Oracle — Communications Cloud Native Core Automated Test Suite Oracle — Communications Cloud Native Core Binding Support Function Oracle — Communications Cloud Native Core Policy Oracle — Communications Unified Inventory Management Oracle — Retail Xstore Point OF Service Oracle — Utilities Framework Oracle — Utilities Testing Accelerator Oracle — Webcenter Portal Xstream — Xstream

CWE

CWE-94, CWE-502
CWE-306, CWE-502

Referencias

JSON original (NVD)

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            },
            {
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              "criteria": "cpe:2.3:a:oracle:webcenter_portal:12.2.1.3.0:*:*:*:*:*:*:*",
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          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "cisaRequiredAction": "Apply updates per vendor instructions.",
  "cisaVulnerabilityName": "XStream Remote Code Execution Vulnerability"
}